Battery drain unfortunately is subjective, much is going to depend on obvious things, usage, talk time, music playing, bluetooth et. all. Turing on and off things like bluetooth, gps, wifi when you dont need them will help. how often you have other email accounts set up to scan for new email will also play alot as well as other things like facebook, other social networking stuff. if your screen is on its brightest setting might want to turn that down. it is now atypical for the battery to get warm during use, but how quickly it cools back down when it isnt is something to pay attention to no doubt. i work nights, i plug my phone in during the day when im sleeping, grab it around 7pm and not on a charger again until 10 or so the next morning with plenty to spare. it will change a bit depending on how much i goof off and play games when i should be working though